{"identifier":"CVE-2026-12330","cve":{"id":"CVE-2026-12330","description":"Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.","published":"2026-06-16T13:16:33.747000+00:00","modified":"2026-10-26T12:10:00.130000+00:00","status":"Analyzed","score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","cvss_version":"3.1","affected":[{"criteria":"cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*","versionStartIncluding":"","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"115.37.0"},{"criteria":"cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*","versionStartIncluding":"140.0","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"140.12.0"},{"criteria":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*","versionStartIncluding":"140.0","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"140.12.0"}],"weaknesses":["CWE-119"],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2029326","source":"security@mozilla.org","tags":["Permissions Required"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-58/","source":"security@mozilla.org","tags":["Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-59/","source":"security@mozilla.org","tags":["Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-61/","source":"security@mozilla.org","tags":["Vendor Advisory"]}],"kev":null,"kev_checked":true,"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","baseScore":5.4,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":2.5}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-16T15:09:18.818466Z","id":"CVE-2026-12330","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*","versionEndExcluding":"115.37.0","matchCriteriaId":"60E86F4A-420C-4F69-8081-79D1F64411C7"},{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*","versionStartIncluding":"140.0","versionEndExcluding":"140.12.0","matchCriteriaId":"E539846C-B1B9-41D9-A589-F46AEF0BFCD6"},{"vulnerable":true,"criteria":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*","versionStartIncluding":"140.0","versionEndExcluding":"140.12.0","matchCriteriaId":"8CDF58C2-CD62-4DAB-9B1C-B48CE10FB31C"}]}]}],"source":"nvd","retrieved_at":"2026-10-28T10:25:35.291013+00:00","exploited":false,"kev_stale":false,"products":["mozilla / firefox","mozilla / thunderbird"],"priority":{"label":"Assess exposure and vendor guidance","reasons":["No higher-priority signal is available in the current stored evidence."]},"epss":{"probability":0.00164,"percentile":0.0564,"date":"2026-10-29","stale":false},"version_assessment":null},"news":[],"campaigns":[],"domains":[{"domain":"bugzilla.mozilla.org","source_url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2029326","investigate_url":"https://investigate.aeglixmind.com/#bugzilla.mozilla.org"},{"domain":"www.mozilla.org","source_url":"https://www.mozilla.org/security/advisories/mfsa2026-58/","investigate_url":"https://investigate.aeglixmind.com/#www.mozilla.org"}],"arsenal_url":"https://arsenal.aeglixmind.com/?cve=CVE-2026-12330","catalog_url":"https://cves.aeglixmind.com/cve/CVE-2026-12330","research_url":"https://investigate.aeglixmind.com/research/cve/CVE-2026-12330","coverage":{"news_candidates_checked":0,"campaign_candidates_checked":0,"bounded":false,"notice":"Exact CVE mentions in stored public excerpts and reviewed campaign content only. A mention is not proof of exploitation, attribution or tool suitability. Missing matches do not establish absence."}}